General Mathematics in 1987
Leipziger Mathematische Antrittsvorlesungen: Auswahl Aus Den Jahren 1869 -- 1922
by
Klein, Felix, Neumann, Carl
Variational Principles of Continuum Mechanics with Engineering Applications: Introduction to Optimal Design Theory
by
Komkov, V.
Nonlinear Equations and Operator Algebras
by
Marchenko, V. a.